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fast

adverb
 
 
/fɑːst/ US  /fæst/

Definition

A2 quickly: The accident was caused by people driving too fast in bad conditions. You'll have to act fast. Children's publishing is a fast-growing business.Fast and rapidShort in time
(Definition of fast adverb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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